Dear Mr Tony;
I'm writing to tell you something about my holiday. I'm so happy beause I have time to relax,but I still spend some time in studying.I have a balance study plan.After the final examination,I know some weak points in my study.I've made up my mind to learn them well.In order to finish my goal,I read books everyday,try my best to study.I read not only the textbooks,but also some masterpieces of some famous writer.And in my spare time I also have some significant things to do,which makes me evey happy.I've become a volnteer and I've done many meaningful things.which taught me a lot.

Best wishes for you.
Yours
XXX